logo separator

[mkgmap-dev] Estrange detours

From Gerd Petermann GPetermann_muenchen at hotmail.com on Fri Jan 6 17:04:04 GMT 2017

It really seems to be a problem with the encoding of the bearings. I have attached a small patch which seems to fix the problem here,
but I am pretty sure that there is more to it. The patch disables the "compacted" format of angles when an indirect arc is found.
I have to analyse my Garmin maps to find out more.

Please try if the results of the patched version are okay for you:


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <GPetermann_muenchen at hotmail.com>
Gesendet: Freitag, 6. Januar 2017 16:47:42
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Estrange detours

Hi Andrzej,

I cannot reproduce this problem in MapSource. In Basecamp car and truck use the correct routing,
motorcycle is as in your picture.
I do not yet have a good idea where to look at. I tried changing the order of objects but that did not
change the results. Maybe there is a special case with the encoding of bearings, but I have no clue.

Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej at poczta.onet.pl>
Gesendet: Freitag, 6. Januar 2017 14:44:53
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] Estrange detours


I have converted all trunks and primary into secondary roads and it
didn't solve problem, so it is rather not connected to Garmin road type
0x02. Still rules for trunks in Spain doesn't fit well into mkgmap
conversion, there could be other problems, like for example weird
navigation messages.

I have found another example for weird routing, where route turns form
primary road into longer detour on service road, see picture angle2. In
my case wrong routing is for car and motorcycle but  goes correctly for
truck. If I change angle for service road like on picture angle2,
routing is correct.

Attached is OSM data extract and test route for BaseCamp.

Best regards,

mkgmap-dev mailing list
mkgmap-dev at lists.mkgmap.org.uk
-------------- next part --------------
A non-text attachment was scrubbed...
Name: detours_alpha.patch
Type: application/x-download
Size: 846 bytes
Desc: detours_alpha.patch
URL: <http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20170106/901c4265/attachment-0001.bin>

More information about the mkgmap-dev mailing list